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400=120-9x
We move all terms to the left:
400-(120-9x)=0
We add all the numbers together, and all the variables
-(-9x+120)+400=0
We get rid of parentheses
9x-120+400=0
We add all the numbers together, and all the variables
9x+280=0
We move all terms containing x to the left, all other terms to the right
9x=-280
x=-280/9
x=-31+1/9
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